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Abstract 1-(2-Carboxyphenyl)-3,3-dimethyltriazene, on being heated in benzaldehyde, affords 2-dimethylaminobenzhydrol and cis- and trans-2,4-diphenyl-1,3-benzodioxins; similar products were obtained with some other carbonyl compounds.
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Nakayama et al. (1973) studied this question.
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